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n <br /> percent, and soils with high sand content and fast percolation rates tend to denitrify at a <br /> lower rate of about 10:percent. <br /> i <br /> A denitrification factor of 25 percent was selected for the Site because of the moderately <br /> fine-grained nature of the soils. <br /> Nitrate Loading Estimate <br /> A nitrate loading scenario was employed to determine the impact from the proposed <br /> project to ground water. The scenario utilizes the variables discussed previously, which <br /> represent the estimated conditions and uses associated with this project. The following <br /> table presents a summary of the assumptions for the nitrate loading calculation for the <br /> Site, as presented in Plate 10. <br /> Table 6. Assumptions for Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Q 1,134.5 gpd Effluent flow rate <br /> Nw 46.9 mglL-N Effluent stream concentration <br /> A 39.70 acres Site area <br /> Nb 1.00 mg/L-N Concentration of rain <br /> d 0.25 constant Denitrification factor <br /> inches per <br /> R 6.57 year Deep percolation of rain water <br /> inches per <br /> W 0.38 year Uniform waste water loading for calculation <br /> The details of the nitrate loading calculation are included in Plate 10. The results of the <br /> calculation are presented in the following table. <br /> Table 7. Result of Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Long-term average concentration of percolating <br /> Nc 2.89 mg/L-N effluent <br /> LOGE0915 Page 12 <br />